Attrition-mill.



A. SGHROEDER.

ATTRITION MILL.

APPLIOATION FILED JUNE 17, 1912.

1,039,326. Patented Sept. 24, 1912.

Il |y i jfw/ff ADAM SCHROEDER, F BARTON, WISCONSIN.

ATTRIIION-MILL.

Specification oi Letters Patent. Application led June 17,: 1912. SerialNo. 703,994.

Patented Sept. 24, 1912.

To 'allflbhowi it may concern." .A s

Be it known that I, ADAM SCHROEDER, a

i citizenof the United States, andresident off of a fixed brid Barton,in the county of Washington and; State of Wisconsin, have inventedcertaln; new and useful Improvements in Attrition-y 'Mills; and I dohereby declare that the fol-g 'lowing ris a full, clear, and exactdescription; i thereof. ,10.

' 'obj'ect being to provide as'imple,

IMy invention refers to4 attrition mills,h.itlsi Velfective andeconomical ,means for effecting a tight.y

'jlo'nt between the non-adjustable rindmgl "disk Iand delivery throatofthe mill '.whereby the finest seed or analogous mate-i rialmay be4delivered between the grinding surfaces 'of'Y he'lrespective disks,wlthout: leakage of said material between the disk and delivery throat,the joint b'eiing'rendered practically airsti'gh't by nested engagement?'ng collar'and a sealing ring that is carrie bythe adjacent grinding.disks-.1 The :constructionand arrangement of the bridging collar andsealing disk are such that the same may readily be attached-temillsofthe' general character to which my invention refers.

With the above vobject in view the invention consists in certainpeculiarities of construction and combination of parts as set forthhereinafter Vwith reference to thev accompanying drawings andsubsequently clalmed.

In the drawings Figure 1 represents a sec- :tional elevation of aportion of an attrition mill embodying the features of my invention, theview showing parts' broken away and parts in full for clearness ofillustration; Fig. 2, a detailed sectional face view of a portion of thesealin ring and collar, the vsection being lindicate by line 2-2 of Fig.1, and Fig. 3, a fragment of the sealingA ring lookin at the reverseside from that shown in Fig. 2. w

Referring by characters to the drawings, 1 represents a housing having awall 1 that is provided' with a circular delivery throat 2, which throatis incased by a hopper 3 that forms part of said housing. Journaled inthe housing are the usual alined oppositely r rotative power shafts 4,4, which power shafts carry inder disks 5, 5, respectively, the grinderisk 5, in conjunction with its shaft, being in this form of milllongitudinally adjustable (by mechanism" not shown) for the purpose ofregulating they able grinding disk 5 is formed with a rim connected byspokes to a hub portion whereby an openmg 1s provided through which lgrade of milled material. 'Ihenon-adjusti the materialpasses to thegrinding surfaces, said non-adjustable disk being in 'uxtaposition tothe delivery throat 2. Eac of these dlsks 1s also provided with, rindingplates 6, 6 respectively, of any desired ty e, it being understood that,all of the a ove described mechanism is usual to grinding lmills "if ofthe character mentioned.

A bridging collar 7 is secured to the houslng wall 1 by means of bolts 7which engage said housing wall and pass through apertured .ears 8 of thecollar, .the bolts be- I' ing of suchy dimensions relative Ito the earapertures as to permit adjustment of .the collar in all directions,whereby 'it can be set concentric. with the non-adjustable .grindingdisk 5.l --The 'collar 7 is provided with a :i

horizontally disposed iiange 49 havin .an outer 'taperedfacelandshoulder; that orms al concentric seat about the disk axis, it be`Vingunderstood that-'the inner face of the collar and its flange portionextend inwardly from the throat 2 and form a feed channel over which the'material kto be ground passes in its travel to the inner surface of therim portion of the grinding disk. Secured to the rim portion of thegrinding disk 5 by 'bolts 10 is a sealing ring 11, which rin due to itsthickness, is oifset from the disr and provided with a tapered innercircular face for nested engagement with the outer tapered face of thecollar ange 9, the inner tapered face bengapproximately the samediameter` as the inner face of the rim portion of the disk to which itis attached. lBy this construction it is apparent that the material to'be ground will ow over the {ianged collar and closed joint between itand the sealing ring, through the spider portion of the disk, to thegrinding lates of the pair of disks, the said material eing ground anddischarged in the usual manner. lFurther-4 more by the sealed joint thusformed between the rotatory disk members and fixed collar, materialcannot sift therethrough, nor

is it possible for the current of air induced to pass out into themachine in an vunground condition and thereby injure the grade of milledmaterial, while with the arrangement of collar and ring as describedthis objectionable feature is entirely overcome, it being apparent thatwhen the nested joint between said ring and collar becomes Worn that thewear can be readily taken up by movement of the shaft 4 longitudinally,and thereafter locking said shaft by a set collar l2, such as shown inconnection with the shaft or other suitable mechanical arrange ment. Itwill also be observed that by employin an apertured ear in connectionwith the bridgingl collar as described, said collar may be so adjustedto the Wallf of the housing as to be self centering with respect to therotatory ring which is carried by the disk 5.

In order to economize space the outer face of the ring 11 is preferablyprovided with countersunk seats through which the apertures for theretaining bolts l0 pass and by this countersunk arran ement clearancefor :the nuts of the retaining bolts 10 .is had, whereby said nuts arenot rendered liable to contact with the adjacent face of the bridgingcollar.

has been foundy that where In practice it fed to the grinding mechawetgrains are nism there is some liability of the grain clicking at themouth of the hopper and to overcome this liability I provide a spiralflight 4 which is securedv to the shaft 4 within the hopper opposite thedelivery throat 2. This flight forms an agitating device for the moistgrain and will positively feed the same to the grinding mechanism.

I claim:

Inan attrition mill having a housing provided with a delivery throat,alined oppositely rotative power shafts and grinder disks carriedthereby; the combination of a bridging collar adjustably secured aboutthe delivery throat of the housing, the collar being provided with aflange having an outer tapered circular face, and a sealing ring securedto one of the disks, the sealing ring being provided with an innertapered circular face for engagement with the outer tapered circular aceof the collar flange.

In testimony that I claim the foregoing I have hereunto set my hand atBartonin the county of Washington and State of Wisconsin in the presenceof two witnesses.

ADAM SCHROEDER.

